import { spawn } from 'node:child_process';
import { chromium } from 'playwright';

const targetUrl = process.env.VERIFY_URL ?? 'http://localhost:5173/';

let serverProcess;
let browser;

try {
  serverProcess = await ensureLocalServer(targetUrl);

  browser = await chromium.launch({ headless: true });
  const page = await browser.newPage({ viewport: { width: 1280, height: 720 } });

  await page.goto(targetUrl, { waitUntil: 'networkidle' });
  await page.evaluate(() => window.localStorage.clear());
  await page.reload({ waitUntil: 'networkidle' });
  await page.waitForSelector('canvas');
  await page.waitForFunction(() => window.__HEROS_GAME__ !== undefined);
  await page.waitForFunction(() => window.__HEROS_DEBUG__ !== undefined);
  await page.waitForTimeout(500);

  const debugBeforeBattle = await page.evaluate(() => window.__HEROS_DEBUG__?.activeScenes() ?? []);
  if (!debugBeforeBattle.includes('TitleScene')) {
    throw new Error(`Expected TitleScene before starting. Active scenes: ${debugBeforeBattle.join(', ')}`);
  }

  await page.mouse.click(962, 240);
  await page.waitForTimeout(250);

  for (let i = 0; i < 20; i += 1) {
    const isBattleActive = await page.evaluate(() => {
      const activeScenes = window.__HEROS_GAME__?.scene.getScenes(true) ?? [];
      return activeScenes.some((scene) => scene.scene.key === 'BattleScene');
    });

    if (isBattleActive) {
      break;
    }

    await page.keyboard.press('Space');
    await page.waitForTimeout(220);
  }

  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_GAME__?.scene.getScenes(true) ?? [];
    return activeScenes.some((scene) => scene.scene.key === 'BattleScene');
  });

  await page.keyboard.press('F9');
  await page.waitForTimeout(100);
  await page.screenshot({ path: 'dist/verification-battle.png', fullPage: true });

  const result = await page.evaluate(() => {
    const canvas = document.querySelector('canvas');
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    const battleState = window.__HEROS_DEBUG__?.battle();

    return {
      activeScenes,
      battleState,
      canvasWidth: canvas?.width ?? 0,
      canvasHeight: canvas?.height ?? 0
    };
  });

  if (result.canvasWidth !== 1280 || result.canvasHeight !== 720) {
    throw new Error(`Unexpected canvas size: ${result.canvasWidth}x${result.canvasHeight}`);
  }

  if (!result.activeScenes.includes('BattleScene')) {
    throw new Error(`BattleScene was not active. Active scenes: ${result.activeScenes.join(', ')}`);
  }

  if (!result.battleState || result.battleState.scene !== 'BattleScene') {
    throw new Error(`Debug battle state was not available: ${JSON.stringify(result.battleState)}`);
  }

  if (result.battleState.battleId !== 'first-battle-zhuo-commandery') {
    throw new Error(`Expected first battle scenario id: ${JSON.stringify(result.battleState)}`);
  }

  if (result.battleState.victoryConditionLabel !== '두령 한석 격파' || result.battleState.defeatConditionLabel !== '유비 퇴각') {
    throw new Error(`Expected first battle objective labels: ${JSON.stringify(result.battleState)}`);
  }

  const openingLeaderObjective = result.battleState.objectives.find((objective) => objective.id === 'leader');
  if (!openingLeaderObjective || openingLeaderObjective.status !== 'active' || openingLeaderObjective.achieved) {
    throw new Error(`Expected live leader objective to start active: ${JSON.stringify(result.battleState.objectives)}`);
  }

  const actionTexturesLoaded = await page.evaluate(() => {
    const textures = window.__HEROS_GAME__?.textures;
    return [
      'unit-liu-bei-actions',
      'unit-guan-yu-actions',
      'unit-zhang-fei-actions',
      'unit-rebel-actions',
      'unit-rebel-archer-actions',
      'unit-rebel-cavalry-actions',
      'unit-rebel-leader-actions'
    ].every((key) => textures?.exists(key));
  });
  if (!actionTexturesLoaded) {
    throw new Error('Expected all unit action textures to be loaded.');
  }

  const movementBlockingState = await page.evaluate(() => {
    const scene = window.__HEROS_GAME__?.scene.getScene('BattleScene');
    const state = window.__HEROS_DEBUG__?.battle();
    const liuBei = state?.units?.find((unit) => unit.id === 'liu-bei');
    const guanYu = state?.units?.find((unit) => unit.id === 'guan-yu');
    const enemy = state?.units?.find((unit) => unit.faction === 'enemy');

    if (!scene || !liuBei || !guanYu || !enemy) {
      throw new Error('Expected battle scene and movement test units.');
    }

    return {
      allyBlocksPath: scene.isMovementBlocked(liuBei, guanYu.x, guanYu.y),
      enemyBlocksPath: scene.isMovementBlocked(liuBei, enemy.x, enemy.y),
      allyStopTileReachable: scene.reachableTiles(liuBei).some((tile) => tile.x === guanYu.x && tile.y === guanYu.y)
    };
  });
  if (
    movementBlockingState.allyBlocksPath ||
    !movementBlockingState.enemyBlocksPath ||
    movementBlockingState.allyStopTileReachable
  ) {
    throw new Error(`Expected allies to be passable path blockers only as stop tiles, and enemies to block movement: ${JSON.stringify(movementBlockingState)}`);
  }

  const liuBeiScreen = await page.evaluate(() => {
    const scene = window.__HEROS_GAME__?.scene.getScene('BattleScene');
    const state = window.__HEROS_DEBUG__?.battle();
    const liuBei = state?.units?.find((unit) => unit.id === 'liu-bei');

    if (!scene || !liuBei) {
      throw new Error('Expected Liu Bei and battle scene for stand-still command test.');
    }

    return {
      x: scene.tileCenterX(liuBei.x),
      y: scene.tileCenterY(liuBei.y)
    };
  });
  await page.mouse.click(liuBeiScreen.x, liuBeiScreen.y);
  await page.waitForTimeout(140);
  await page.mouse.click(liuBeiScreen.x, liuBeiScreen.y);
  await page.waitForTimeout(180);

  const standStillCommandState = await page.evaluate(() => window.__HEROS_DEBUG__?.battle());
  if (
    standStillCommandState?.phase !== 'command' ||
    standStillCommandState.selectedUnitId !== 'liu-bei' ||
    standStillCommandState.pendingMove?.unitId !== 'liu-bei' ||
    standStillCommandState.pendingMove.from.x !== standStillCommandState.pendingMove.to.x ||
    standStillCommandState.pendingMove.from.y !== standStillCommandState.pendingMove.to.y
  ) {
    throw new Error(`Expected Liu Bei to open commands without moving: ${JSON.stringify(standStillCommandState)}`);
  }

  await page.evaluate(() => {
    const scene = window.__HEROS_GAME__?.scene.getScene('BattleScene');
    if (!scene) {
      return;
    }
    scene.selectedUnit = undefined;
    scene.pendingMove = undefined;
    scene.targetingAction = undefined;
    scene.selectedUsable = undefined;
    scene.phase = 'idle';
    scene.clearMarkers();
    scene.hideCommandMenu();
    scene.hideMapMenu();
  });

  await page.waitForTimeout(700);
  await page.mouse.click(260, 300, { button: 'right' });
  await page.waitForTimeout(120);
  await page.mouse.click(182, 196);
  await page.waitForTimeout(160);

  const threatState = await page.evaluate(() => window.__HEROS_DEBUG__?.battle());
  if (!threatState?.threatMarkerCount || threatState.threatMarkerCount <= 0) {
    throw new Error(`Expected enemy threat markers from map menu: ${JSON.stringify(threatState)}`);
  }

  await page.mouse.click(260, 300, { button: 'right' });
  await page.waitForTimeout(120);
  await page.mouse.click(182, 230);
  await page.waitForTimeout(120);
  await page.mouse.click(400, 213);
  await page.waitForTimeout(180);

  const battleSlotSave = await page.evaluate(() => {
    const raw = window.localStorage.getItem('heros-web:battle:first-battle-zhuo-commandery:slot-1');
    return raw ? JSON.parse(raw) : undefined;
  });
  if (!battleSlotSave || battleSlotSave.battleId !== 'first-battle-zhuo-commandery') {
    throw new Error(`Expected slot 1 battle save from save UI: ${JSON.stringify(battleSlotSave)}`);
  }

  await page.mouse.click(260, 300, { button: 'right' });
  await page.waitForTimeout(120);
  await page.mouse.click(182, 264);
  await page.waitForTimeout(120);
  await page.mouse.click(400, 213);
  await page.waitForFunction(() => window.__HEROS_DEBUG__?.battle()?.scene === 'BattleScene');

  const cameraBeforeScroll = result.battleState.camera;
  if (
    !cameraBeforeScroll ||
    cameraBeforeScroll.mapWidth <= cameraBeforeScroll.visibleColumns ||
    cameraBeforeScroll.mapHeight <= cameraBeforeScroll.visibleRows
  ) {
    throw new Error(`Expected a scrollable battle map: ${JSON.stringify(cameraBeforeScroll)}`);
  }

  await page.mouse.move(872, 360);
  await page.waitForTimeout(520);
  const cameraAfterEdgeScroll = await page.evaluate(() => window.__HEROS_DEBUG__?.battle()?.camera);
  if (!cameraAfterEdgeScroll || cameraAfterEdgeScroll.x <= cameraBeforeScroll.x) {
    throw new Error(`Expected edge scrolling to move camera right: ${JSON.stringify({ cameraBeforeScroll, cameraAfterEdgeScroll })}`);
  }

  await page.mouse.click(1138, 553);
  await page.waitForTimeout(160);
  const cameraAfterMiniMapClick = await page.evaluate(() => window.__HEROS_DEBUG__?.battle()?.camera);
  if (
    !cameraAfterMiniMapClick ||
    cameraAfterMiniMapClick.x < cameraAfterMiniMapClick.mapWidth - cameraAfterMiniMapClick.visibleColumns ||
    cameraAfterMiniMapClick.y !== 0
  ) {
    throw new Error(`Expected minimap click to move camera to the northeast: ${JSON.stringify(cameraAfterMiniMapClick)}`);
  }

  const readyUnits = result.battleState.units.filter((unit) => !unit.acted);
  if (!readyUnits.some((unit) => unit.animating && unit.animationKey?.includes('-idle-'))) {
    throw new Error(`Expected ready units to loop idle frames: ${JSON.stringify(readyUnits)}`);
  }

  await page.keyboard.press('F9');
  await page.waitForTimeout(100);

  await page.evaluate(() => window.__HEROS_DEBUG__?.forceBattleOutcome('victory'));
  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.battleOutcome === 'victory' && state?.phase === 'resolved' && state?.resultVisible === true;
  });

  const victoryState = await page.evaluate(() => window.__HEROS_DEBUG__?.battle());
  const livingEnemiesAfterVictory = victoryState.units.filter((unit) => unit.faction === 'enemy' && unit.hp > 0);
  if (livingEnemiesAfterVictory.length > 0) {
    throw new Error(`Expected no living enemies after forced victory: ${JSON.stringify(livingEnemiesAfterVictory)}`);
  }
  const victoryLeaderObjective = victoryState.objectives.find((objective) => objective.id === 'leader');
  if (!victoryLeaderObjective || victoryLeaderObjective.status !== 'done' || !victoryLeaderObjective.achieved) {
    throw new Error(`Expected leader objective to resolve after victory: ${JSON.stringify(victoryState.objectives)}`);
  }

  await page.screenshot({ path: 'dist/verification-battle-result-victory.png', fullPage: true });

  await page.mouse.click(738, 642);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('CampScene');
  });
  await page.screenshot({ path: 'dist/verification-camp.png', fullPage: true });

  const campState = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (!campState || campState.scene !== 'CampScene' || campState.report?.rewardGold <= 0) {
    throw new Error(`Expected CampScene report after victory: ${JSON.stringify(campState)}`);
  }

  await page.evaluate(() => {
    const campScene = window.__HEROS_GAME__?.scene.getScene('CampScene');
    const liuBei = campScene?.campaign?.roster?.find((unit) => unit.id === 'liu-bei');
    if (!liuBei) {
      throw new Error('Expected Liu Bei in camp roster before supply verification.');
    }
    liuBei.hp = Math.max(1, liuBei.maxHp - 10);
    campScene.report?.units?.forEach((unit) => {
      if (unit.id === 'liu-bei') {
        unit.hp = liuBei.hp;
      }
    });
    campScene.render();
  });
  await page.mouse.click(918, 38);
  await page.waitForTimeout(160);
  await page.screenshot({ path: 'dist/verification-camp-supplies.png', fullPage: true });
  await page.mouse.click(1120, 245);
  await page.waitForTimeout(260);

  const campStateAfterSupply = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  const liuBeiAfterSupply = campStateAfterSupply?.campaign?.roster?.find((unit) => unit.id === 'liu-bei');
  if (!liuBeiAfterSupply || liuBeiAfterSupply.hp !== liuBeiAfterSupply.maxHp) {
    throw new Error(`Expected bean supply to recover Liu Bei: ${JSON.stringify(campStateAfterSupply)}`);
  }
  if ((campStateAfterSupply.campaign?.inventory?.['콩'] ?? 0) !== 0) {
    throw new Error(`Expected bean supply to be consumed: ${JSON.stringify(campStateAfterSupply.campaign?.inventory)}`);
  }

  const goldBeforeMerchant = campStateAfterSupply.campaign?.gold ?? 0;
  await page.mouse.click(702, 386);
  await page.waitForTimeout(220);

  const campStateAfterMerchant = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (
    (campStateAfterMerchant.campaign?.inventory?.['콩'] ?? 0) !== 1 ||
    campStateAfterMerchant.campaign?.gold !== goldBeforeMerchant - 40
  ) {
    throw new Error(`Expected merchant purchase to add bean and spend gold: ${JSON.stringify({ goldBeforeMerchant, campStateAfterMerchant })}`);
  }

  await page.mouse.click(830, 38);
  await page.waitForTimeout(120);
  await page.mouse.click(974, 482);
  await page.waitForTimeout(260);

  const campStateAfterDialogue = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (!campStateAfterDialogue.report?.completedCampDialogues?.length) {
    throw new Error(`Expected camp dialogue to award bond exp: ${JSON.stringify(campStateAfterDialogue)}`);
  }

  const campaignSaveAfterDialogue = await page.evaluate(() => {
    const raw = window.localStorage.getItem('heros-web:campaign-state');
    return raw ? JSON.parse(raw) : undefined;
  });
  if (
    !campaignSaveAfterDialogue ||
    campaignSaveAfterDialogue.step !== 'first-camp' ||
    campaignSaveAfterDialogue.latestBattleId !== 'first-battle-zhuo-commandery' ||
    !campaignSaveAfterDialogue.battleHistory?.['first-battle-zhuo-commandery'] ||
    !campaignSaveAfterDialogue.completedCampDialogues?.length ||
    Object.keys(campaignSaveAfterDialogue.inventory ?? {}).length === 0
  ) {
    throw new Error(`Expected campaign save to persist camp progress: ${JSON.stringify(campaignSaveAfterDialogue)}`);
  }

  const campaignSlotAfterDialogue = await page.evaluate(() => {
    const raw = window.localStorage.getItem('heros-web:campaign-state:slot-1');
    return raw ? JSON.parse(raw) : undefined;
  });
  if (!campaignSlotAfterDialogue || campaignSlotAfterDialogue.latestBattleId !== 'first-battle-zhuo-commandery') {
    throw new Error(`Expected campaign slot 1 to persist progress: ${JSON.stringify(campaignSlotAfterDialogue)}`);
  }

  await page.mouse.click(1120, 38);
  await page.waitForTimeout(180);
  const campStateWithSortiePrep = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (!campStateWithSortiePrep?.sortieVisible) {
    throw new Error(`Expected sortie preparation overlay from next story button: ${JSON.stringify(campStateWithSortiePrep)}`);
  }
  await page.screenshot({ path: 'dist/verification-camp-sortie.png', fullPage: true });

  await page.mouse.click(792, 596);
  await page.waitForTimeout(140);
  const campStateAfterSortieClose = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (campStateAfterSortieClose?.sortieVisible) {
    throw new Error(`Expected sortie preparation overlay to close: ${JSON.stringify(campStateAfterSortieClose)}`);
  }

  await page.mouse.click(1120, 38);
  await page.waitForTimeout(120);
  await page.mouse.click(938, 596);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('StoryScene');
  });

  for (let i = 0; i < 24; i += 1) {
    const isSecondBattleActive = await page.evaluate(() => {
      const state = window.__HEROS_DEBUG__?.battle();
      return state?.scene === 'BattleScene' && state?.battleId === 'second-battle-yellow-turban-pursuit';
    });

    if (isSecondBattleActive) {
      break;
    }

    await page.keyboard.press('Space');
    await page.waitForTimeout(320);
  }

  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.scene === 'BattleScene' && state?.battleId === 'second-battle-yellow-turban-pursuit' && state?.battleOutcome === null && state?.phase === 'idle';
  });
  await page.screenshot({ path: 'dist/verification-second-battle.png', fullPage: true });

  const secondBattleState = await page.evaluate(() => window.__HEROS_DEBUG__?.battle());
  const secondEnemies = secondBattleState.units.filter((unit) => unit.faction === 'enemy');
  const secondEnemyBehaviors = new Set(secondEnemies.map((unit) => unit.ai));
  if (
    secondBattleState.camera?.mapWidth !== 24 ||
    secondBattleState.camera?.mapHeight !== 20 ||
    secondEnemies.length < 10 ||
    !secondEnemyBehaviors.has('aggressive') ||
    !secondEnemyBehaviors.has('guard') ||
    !secondEnemyBehaviors.has('hold')
  ) {
    throw new Error(`Expected expanded second battle map and mixed enemy AI: ${JSON.stringify(secondBattleState)}`);
  }

  await page.evaluate(() => window.__HEROS_DEBUG__?.forceBattleOutcome('victory'));
  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.battleOutcome === 'victory' && state?.phase === 'resolved' && state?.resultVisible === true;
  });

  await page.mouse.click(738, 642);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('CampScene');
  });

  const campaignSaveAfterSecondBattle = await page.evaluate(() => {
    const raw = window.localStorage.getItem('heros-web:campaign-state');
    return raw ? JSON.parse(raw) : undefined;
  });
  if (
    !campaignSaveAfterSecondBattle ||
    campaignSaveAfterSecondBattle.step !== 'second-camp' ||
    campaignSaveAfterSecondBattle.latestBattleId !== 'second-battle-yellow-turban-pursuit' ||
    !campaignSaveAfterSecondBattle.battleHistory?.['second-battle-yellow-turban-pursuit'] ||
    !campaignSaveAfterSecondBattle.completedCampDialogues?.length
  ) {
    throw new Error(`Expected campaign save to persist second battle victory: ${JSON.stringify(campaignSaveAfterSecondBattle)}`);
  }

  await page.mouse.click(1120, 38);
  await page.waitForTimeout(160);
  const secondCampSortieState = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (!secondCampSortieState?.sortieVisible) {
    throw new Error(`Expected second camp sortie preparation overlay: ${JSON.stringify(secondCampSortieState)}`);
  }
  await page.mouse.click(938, 596);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('StoryScene');
  });

  for (let i = 0; i < 24; i += 1) {
    const isThirdBattleActive = await page.evaluate(() => {
      const state = window.__HEROS_DEBUG__?.battle();
      return state?.scene === 'BattleScene' && state?.battleId === 'third-battle-guangzong-road';
    });

    if (isThirdBattleActive) {
      break;
    }

    await page.keyboard.press('Space');
    await page.waitForTimeout(320);
  }

  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.scene === 'BattleScene' && state?.battleId === 'third-battle-guangzong-road' && state?.battleOutcome === null && state?.phase === 'idle';
  });
  await page.screenshot({ path: 'dist/verification-third-battle.png', fullPage: true });

  const thirdBattleState = await page.evaluate(() => window.__HEROS_DEBUG__?.battle());
  const thirdEnemies = thirdBattleState.units.filter((unit) => unit.faction === 'enemy');
  const thirdEnemyBehaviors = new Set(thirdEnemies.map((unit) => unit.ai));
  if (
    thirdBattleState.camera?.mapWidth !== 24 ||
    thirdBattleState.camera?.mapHeight !== 20 ||
    thirdBattleState.victoryConditionLabel !== '전령 마원 격파' ||
    thirdEnemies.length < 10 ||
    !thirdEnemyBehaviors.has('aggressive') ||
    !thirdEnemyBehaviors.has('guard') ||
    !thirdEnemyBehaviors.has('hold')
  ) {
    throw new Error(`Expected third battle map, objective, and mixed enemy AI: ${JSON.stringify(thirdBattleState)}`);
  }

  await page.evaluate(() => window.__HEROS_DEBUG__?.forceBattleOutcome('victory'));
  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.battleOutcome === 'victory' && state?.phase === 'resolved' && state?.resultVisible === true;
  });

  await page.mouse.click(738, 642);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('CampScene');
  });

  const campaignSaveAfterThirdBattle = await page.evaluate(() => {
    const raw = window.localStorage.getItem('heros-web:campaign-state');
    return raw ? JSON.parse(raw) : undefined;
  });
  if (
    !campaignSaveAfterThirdBattle ||
    campaignSaveAfterThirdBattle.step !== 'third-camp' ||
    campaignSaveAfterThirdBattle.latestBattleId !== 'third-battle-guangzong-road' ||
    !campaignSaveAfterThirdBattle.battleHistory?.['third-battle-guangzong-road']
  ) {
    throw new Error(`Expected campaign save to persist third battle victory: ${JSON.stringify(campaignSaveAfterThirdBattle)}`);
  }

  await page.mouse.click(1120, 38);
  await page.waitForTimeout(160);
  const thirdCampSortieState = await page.evaluate(() => window.__HEROS_DEBUG__?.camp());
  if (!thirdCampSortieState?.sortieVisible) {
    throw new Error(`Expected third camp sortie preparation overlay: ${JSON.stringify(thirdCampSortieState)}`);
  }
  await page.mouse.click(938, 596);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('StoryScene');
  });

  for (let i = 0; i < 26; i += 1) {
    const isFourthBattleActive = await page.evaluate(() => {
      const state = window.__HEROS_DEBUG__?.battle();
      return state?.scene === 'BattleScene' && state?.battleId === 'fourth-battle-guangzong-camp';
    });

    if (isFourthBattleActive) {
      break;
    }

    await page.keyboard.press('Space');
    await page.waitForTimeout(320);
  }

  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.scene === 'BattleScene' && state?.battleId === 'fourth-battle-guangzong-camp' && state?.battleOutcome === null && state?.phase === 'idle';
  });
  await page.screenshot({ path: 'dist/verification-fourth-battle.png', fullPage: true });

  const fourthBattleState = await page.evaluate(() => window.__HEROS_DEBUG__?.battle());
  const fourthEnemies = fourthBattleState.units.filter((unit) => unit.faction === 'enemy');
  const fourthEnemyBehaviors = new Set(fourthEnemies.map((unit) => unit.ai));
  if (
    fourthBattleState.camera?.mapWidth !== 24 ||
    fourthBattleState.camera?.mapHeight !== 20 ||
    fourthBattleState.victoryConditionLabel !== '장각 격파' ||
    fourthEnemies.length < 12 ||
    !fourthEnemyBehaviors.has('aggressive') ||
    !fourthEnemyBehaviors.has('guard') ||
    !fourthEnemyBehaviors.has('hold')
  ) {
    throw new Error(`Expected fourth battle map, objective, and mixed enemy AI: ${JSON.stringify(fourthBattleState)}`);
  }

  await page.evaluate(() => window.__HEROS_DEBUG__?.forceBattleOutcome('victory'));
  await page.waitForFunction(() => {
    const state = window.__HEROS_DEBUG__?.battle();
    return state?.battleOutcome === 'victory' && state?.phase === 'resolved' && state?.resultVisible === true;
  });

  await page.mouse.click(738, 642);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('CampScene');
  });

  const campaignSaveAfterFourthBattle = await page.evaluate(() => {
    const raw = window.localStorage.getItem('heros-web:campaign-state');
    return raw ? JSON.parse(raw) : undefined;
  });
  if (
    !campaignSaveAfterFourthBattle ||
    campaignSaveAfterFourthBattle.step !== 'fourth-camp' ||
    campaignSaveAfterFourthBattle.latestBattleId !== 'fourth-battle-guangzong-camp' ||
    !campaignSaveAfterFourthBattle.battleHistory?.['fourth-battle-guangzong-camp']
  ) {
    throw new Error(`Expected campaign save to persist fourth battle victory: ${JSON.stringify(campaignSaveAfterFourthBattle)}`);
  }

  await page.evaluate(() => window.__HEROS_GAME__?.scene.start('TitleScene'));
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('TitleScene');
  });
  await page.mouse.click(962, 310);
  await page.waitForFunction(() => {
    const activeScenes = window.__HEROS_DEBUG__?.activeScenes() ?? [];
    return activeScenes.includes('CampScene');
  });

  console.log(`Verified title-to-fourth-battle flow, result states, and debug API at ${targetUrl}`);
} finally {
  await browser?.close();
  if (serverProcess && !serverProcess.killed) {
    serverProcess.kill();
  }
}

async function ensureLocalServer(url) {
  if (await canReach(url)) {
    return undefined;
  }

  const parsed = new URL(url);
  const isLocal = ['localhost', '127.0.0.1', '0.0.0.0'].includes(parsed.hostname);
  if (!isLocal) {
    throw new Error(`No server responded at ${url}`);
  }

  const stderr = [];
  const child = spawn(process.execPath, ['node_modules/vite/bin/vite.js', '--host', '127.0.0.1', '--port', parsed.port || '5173'], {
    cwd: process.cwd(),
    env: process.env,
    stdio: ['ignore', 'pipe', 'pipe']
  });

  child.stderr.on('data', (chunk) => stderr.push(chunk.toString()));
  child.stdout.on('data', () => {});

  for (let i = 0; i < 80; i += 1) {
    if (await canReach(url)) {
      return child;
    }
    await delay(250);
  }

  child.kill();
  throw new Error(`Vite server did not start at ${url}\n${stderr.join('')}`);
}

async function canReach(url) {
  try {
    const response = await fetch(url, { signal: AbortSignal.timeout(1000) });
    return response.ok;
  } catch {
    return false;
  }
}

function delay(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}